package com.xjz.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.collection.CollUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.xjz.common.enums.ErrorCode;
import com.xjz.constant.CommonConstant;
import com.xjz.exception.BusinessException;
import com.xjz.exception.ThrowUtils;
import com.xjz.model.dto.user.UserQueryRequest;
import com.xjz.model.entity.User;
import com.xjz.model.enums.UserRoleEnum;
import com.xjz.model.vo.LoginUserVO;
import com.xjz.model.vo.UserVO;
import com.xjz.service.UserService;
import com.xjz.mapper.UserMapper;
import com.xjz.utils.SqlUtils;
import lombok.extern.slf4j.Slf4j;
import me.chanjar.weixin.common.bean.WxOAuth2UserInfo;
import org.apache.commons.lang3.StringUtils;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

import static com.xjz.constant.UserConstant.USER_LOGIN_STATE;

/**
* @author 86135
* @description 针对表【user(用户)】的数据库操作Service实现
* @createDate 2025-08-02 15:49:55
*/

@Service
@Slf4j

public class UserServiceImpl extends ServiceImpl<UserMapper, User>
    implements UserService{

    @Resource
    private CommonConstant commonConstant;

    @Override
    public Long userRegister(String userAccount, String userPassword, String checkPassword) {
        // 1. 校验
        if (StringUtils.isAnyBlank(userAccount, userPassword, checkPassword)) {
            ThrowUtils.throwIf(true, ErrorCode.PARAMS_ERROR,"参数为空");
        }

        if (userAccount.length() < 4) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"用户账号过短");
        }

        if (userPassword.length() < 8 || checkPassword.length() < 8) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"用户密码过短");
        }

        //密码和校验密码相同
        if (!userPassword.equals(checkPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"两次输入的密码不一致");
        }

        synchronized (userAccount.intern()) {
            //账户不能重复
            QueryWrapper<User> queryWrapper = new QueryWrapper<>();
            queryWrapper.eq("userAccount",userAccount);
            long count = count(queryWrapper);
            if (count > 0) {
                throw new BusinessException(ErrorCode.PARAMS_ERROR,"账户重复");
            }

            //加密
            String encryptPassword = DigestUtils.md5DigestAsHex((commonConstant.SALT + userPassword).getBytes());

            //插入数据
            User user = new User();
            user.setUserAccount(userAccount);
            user.setUserPassword(encryptPassword);
            boolean saveRes = save(user);
            if (!saveRes) {
                throw new BusinessException(ErrorCode.SYSTEM_ERROR,"注册失败");
            }
            return user.getId();

        }
    }

    @Override
    public LoginUserVO userLogin(String userAccount, String userPassword, HttpServletRequest request) {
        if (StringUtils.isAnyBlank(userAccount, userPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
        }

        if (userAccount.length() < 4) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户账号过短");
        }

        if (userPassword.length() < 8) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户密码过短");
        }

        //加密
        String encryptPassword = DigestUtils.md5DigestAsHex((commonConstant.SALT + userPassword).getBytes());
        //查询用户是否存在
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("userAccount",userAccount);
        queryWrapper.eq("userPassword",encryptPassword);
        User user = this.baseMapper.selectOne(queryWrapper);
        //用户不存在
        if (user == null) {
            log.info("user login failed, userAccount cannot match userPassword");
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户不存在或密码错误");
        }

        //记录用户的登录态
        request.getSession().setAttribute(USER_LOGIN_STATE, user);
        return this.getLoginUserVO(user);
    }

    @Override
    public LoginUserVO userLoginByMpOpen(WxOAuth2UserInfo wxOAuth2UserInfo, HttpServletRequest request) {
        //开放平台Id
        String unionId = wxOAuth2UserInfo.getUnionId();
        //公众号OpenId
        String mpOpenId = wxOAuth2UserInfo.getOpenid();

        //单机锁
        synchronized (unionId.intern()) {
            QueryWrapper<User> queryWrapper = new QueryWrapper<>();
            queryWrapper.eq("unionId",unionId);
            User user = getOne(queryWrapper);
            //封号，禁止登录
            ThrowUtils.throwIf(user != null && UserRoleEnum.BAN.getValue().equals(user.getUserRole()),
                    ErrorCode.FORBIDDEN_ERROR,"该用户被封禁,禁止登录");
            //用户不存在则创建
            if (user == null) {
                user = new User();
                user.setUnionId(unionId);
                user.setMpOpenId(mpOpenId);
                user.setUserAvatar(wxOAuth2UserInfo.getHeadImgUrl());
                user.setUserName(wxOAuth2UserInfo.getNickname());
                boolean result = save(user);
                ThrowUtils.throwIf(!result, ErrorCode.SYSTEM_ERROR,"登录失败");
            }
            //记录用户的登录态
            request.getSession().setAttribute(USER_LOGIN_STATE, user);
            return this.getLoginUserVO(user);
        }
    }

    @Override
    public User getLoginUser(HttpServletRequest request) {
        Object userObj = request.getSession().getAttribute(USER_LOGIN_STATE);
        User currentUser = (User) userObj;
        if (currentUser == null || currentUser.getId() == null) {
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }

        //从数据库中查询（追求性能的话可以注释，直接走缓存）
        Long userId = currentUser.getId();
        User user = getById(userId);
        if (user == null) {
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        return user;
    }

    @Override
    public User getLoginUserPermitNull(HttpServletRequest request) {
        Object userObj = request.getSession().getAttribute(USER_LOGIN_STATE);
        User currentUser = (User) userObj;
        if (currentUser == null || currentUser.getId() == null) {
            return null;
        }

        // 从数据库查询（追求性能的话可以注释，直接走缓存）
        long userId = currentUser.getId();
        return getById(userId);
    }

    @Override
    public boolean isAdmin(User user) {
        return user != null && user.getUserRole().equals(UserRoleEnum.ADMIN.getValue());
    }

    @Override
    public boolean userLogout(HttpServletRequest request) {
        if (request.getSession().getAttribute(USER_LOGIN_STATE) == null) {
            throw new BusinessException(ErrorCode.OPERRATION_ERROR,"未登录");
        }

        //移除登录态
        request.getSession().removeAttribute(USER_LOGIN_STATE);
        return true;
    }

    @Override
    public UserVO getUserVO(User user) {
        if (user == null) {
            return null;

        }

        UserVO userVO = new UserVO();
        BeanUtil.copyProperties(user, userVO);
        return userVO;
    }

    @Override
    public List<UserVO> getUserVO(List<User> userList) {
        if (CollUtil.isEmpty(userList)) {
            return new ArrayList<>();
        }

        return userList.stream().map(this::getUserVO).collect(Collectors.toList());
    }

    @Override
    public QueryWrapper<User> getQueryWrapper(UserQueryRequest userQueryRequest) {
        if (userQueryRequest == null) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"请求参数为空");
        }

        Long id = userQueryRequest.getId();
        String unionId = userQueryRequest.getUnionId();
        String mpOpenId = userQueryRequest.getMpOpenId();
        String userName = userQueryRequest.getUserName();
        String userProfile = userQueryRequest.getUserProfile();
        String userRole = userQueryRequest.getUserRole();
        String sortField = userQueryRequest.getSortField();
        String sortOrder = userQueryRequest.getSortOrder();
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq(id != null, "id", id);
        queryWrapper.eq(StringUtils.isNotBlank(unionId), "unionId", unionId);
        queryWrapper.eq(StringUtils.isNotBlank(mpOpenId), "mpOpenId", mpOpenId);
        queryWrapper.eq(StringUtils.isNotBlank(userRole), "userRole", userRole);
        queryWrapper.like(StringUtils.isNotBlank(userProfile), "userProfile", userProfile);
        queryWrapper.like(StringUtils.isNotBlank(userName), "userName", userName);
        queryWrapper.orderBy(SqlUtils.validSortField(sortField), sortOrder.equals(CommonConstant.SORT_ORDER_ASC),sortField);

        return queryWrapper;
    }


    @Override
    public LoginUserVO getLoginUserVO(User user) {
        if (user == null) {
            return null;
        }

        LoginUserVO userVO = new LoginUserVO();
        BeanUtil.copyProperties(user, userVO);
        return userVO;
    }
}




